Combined lamp-shade and reflector.



No.'785,0l7.- PATBNTED MAR. 14, 1905.

' A; P. MQARTHUR.

COMBINED LAMP SHADE AND REFLECTOR.

, APPLICATION FILED SEPT. 19, 1904.

1N VEN TOR.

1 TTORNEY.

Patented March 14, 1905.

PATENT OFFICE.

ALEXANDER P. MoARTI-IUR, OF NEW YORK, N. Y.

COMBINED LAMP-,SHADE AND REFLECTOR.

SPECIFICATION formingpart of Letters Patent No. 785,017, dated March 1'1, 1905.

Application filed September 19, 1904. Serial No. 225,022.

T0 at whom it may concern:

Be it known that I, ALEXANDER P. MoAn THUR, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in a Gombined Lamp-Shade and Reflector, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in lamp-shades and reflectors; and it consists in the novel construction of shade more fully set forth in the specification, and pointed out in the claims.

In the drawings, Figure 1 is an elevation of my improved shade applied to the chimney of the lamp. Fig. 2 is a middle vertical section thereof. Fig. 3 is a cross-section on line 3 3 of Fig. 1. Fig. 4 is a detail showing modified form of spacing-pieces, and Fig. 5 is a detail showing a modified disposition of the reflecting-ribs.

The present invention is an improvement on the shade and reflector shown and described in pending application, filed August 6, 1903, Serial No.-168,427, and, like it, has for its object to produce a combined shade and reflector which shall reflect the light-rays back into the reflector and out at the open mouth of the same, thisreflector, however, being in the present instance intensified by reason of the specific disposition of the prisms forming the reflecting-surface.

Afurther object is to produce a shade which will be affected by the heat of the chimney as little as possible.

In detail the invention may be described as follows:

Referring to the drawings, C represents an ordinary lamp-chimney, and S the shade and reflector composed of a single piece of glass. The latter is made of any desirable shape or contour approaching on the conical, as clearly shown in the drawings, and has a smooth inner surface. Extending along the inner surface of the neck 1 thereof and gradually merging or disappearing in the corresponding surface of the body portion of the shade are a series of spacing-ribs 2 ,'which engage the chimney C, thus leaving air-spaces 3 between it and the shade allowing air to freely circulate therethrough and keep the shade cool. disconnected projections 2 may be substituted, as seen on the modification in Fig. 4. The outer surface of the shade is covered with distinct series ofreflecting-prisms P P P P, as shown in Figs. 1 and 2, or A A A, as shown in the modification in Fig. 5, the peculiarity of disposition of the several series being that they are arranged in step-like formation, those of one series being disposed along a curved surface raised relatively above (or removed from) the surface of disposition of the adjacent series. Thus the prisms P are raised above prisms P P and P P are raised above the series P. So prisms A are raised above prisms Aand A above A. In Figs. 1 and 2 the prisms P P belong to the same series, except that one prism is longer than the other, this arrangement making a corresponding change in the lengths of the adjacent reflecting-faces of prisms P and preventing the twisting of the refracted rays so characteristic of this class of devices. The prisms being thus disposed along the curved surfaces occupyin different positions relatively to the vertica axis of the shade produce reflecting effects of a distinctive character, and the reflection of the light outward from the mouth of the shade is increased to a maximum. Besides, by shortening one of the faces of the prisms P as above indicated, that peculiar blending and twisting of the refracted rays so common in shades having prismatic faces is in a measure avoided, the rays in the present instance being well defined, the one set being distinct from its adjacent set.

I I do not, of course, wish to be limited to the precise form of shade or prisms, though the triangular prism is the preferable. Neither do I wish the application of the shade limited to chimneys, as the same may be passed over 9 incandescent electric-light globes or bulbs.

Having described my invention, what I claim is 1. A shade and reflector composed of a single piece of glass and having a neck for en- In lieu of the ribs 2 a series of gaging the Walls of a chimney or electric bulb, the inside of said reflector being smooth, the outer surface of said reflector being substantially covered With series of integral risms calculated to reflect the light-rays bac into the reflector and out at the open mouth thereof, those of one series being raised in steplike formation above those ofthe adjacent series, substantially as set forth.

2. A shade and reflector composed of a single piece of glass and having a neck for enveloping a chimney or electric bulb, and having a series of inner spacing devices for engaging the Wall of the chimney or bulb, the inside of said reflector being smooth, the outer surface of said reflector being substantially covered With series of integral risms calculated to reflect the light-rays badli into the reflector and out at the open mouth thereof, those of one series being raised or superimposed above those of the adjacent series in step-like formation, substantially as set forth. 3. A reflector composed of a single piece of glass having a smooth inside, and an exterior surface covered With series of light-reflecting prisms, the different series beingsuperimposed relatively above one another in stepike formation, substantially as set forth.

4. A reflector having series of reflectingprisms disposed along its outer surface, those of one series being disposed along a curved surface and removed a suitable distance from the surface .of disposition of the next adjacent series, substantially as set forth.

5. A reflector having series of reflectingprisms disposed along its outer face in stepike formation, a portion of the prisms forming an intermediate series being of different lengths, making a corresponding difference in the lengths of the reflecting-faces of the .neXt adjacent series, substantially as set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

ALEXANDER P. McARTI-IURQ Witnesses:

FRED O. RITTER, GEORGE SHAFFER. 

